Endocrine, Ecophysiological and Ecological Aspects of Seasonal Adaptations in a Water Strider, Aquarius paludum (A Mini Review)

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概要

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• The water strider Aquarius paludum is distributed widely in the palearctic region (Andersen, 1990) and inhabits both permanent and temporary water bodies (Harada et al., 1997). A. paludum is a very successful species that can adapt to a wide variety of habitats. This mini-review suggests that this wide habitat is caused by its flexible responses to the important environmental factors. Populations of A. paludum in Kochi (133°N, 33°E) are used as a model, because they show trivoltinism and dynamic seasonal variation in life history. Environmental factors which are predictable or unpredictable can control its life history. Indeed, constant long days induce short wings and reproduction, whereas constant short days induce long wings and diapause, and the critical photoperiod for wing morphs is longer by 1 hour than that for reproduction. High temperature of 30℃ in nymphal stage and moderate temperature of 25℃ after emergence induce rapid maturation of flight ability within the first 5 imaginal days and promote the histolysis of flight muscles and reproductive maturation during the next week. In the Kochi strain of A. paludum, high population density during the nymphal stage delays the histolysis of flight muscles. A step-wise decrease of photophase by 1 or 2 hrs in total during the nymphal period results in critical photoperiods longer by 1 hour for both determination of wing morphs and reproduction. On the other hand, an increase of photophase promotes the histolysis of flight muscles and reduces flight propensity, at least after 40 days of imaginal life. Integrated control of life history by these several factors in natural populations of A. paludum in Kochi is discussed. Overwintered and reproductive adults of A. paludum had larger corpora allata than diapause adults in fall in a Czech population. Juvenile hormone from the corpus allatum may be involved in the control of the reproductive system as in other insects.

• 日本昆虫学会の論文
• 2000-03-25

著者

• Kishi M.

  Laboratory Of Environmental Physiology Faculty Of Education Kochi University

• HARADA T.

  Laboratory of Environmental Physiology, Faculty of Education, Kochi University

• INOUE T.

  Laboratory of Environmental Physiology, Faculty of Education, Kochi University

• ONO I.

  Laboratory of Environmental Physiology, Faculty of Education, Kochi University

• KAWAMURA N.

  Laboratory of Environmental Physiology, Faculty of Education, Kochi University

• DOI K.

  Laboratory of Environmental Physiology, Faculty of Education, Kochi University

• INOUE S.

  Laboratory of Environmental Physiology, Faculty of Education, Kochi University

• HODKOVA M.

  Entomological Institute, Czech Academy of Sciences

• Hodkova M.

  Entomological Institute Czech Academy Of Sciences

関連論文

• Endocrine, Ecophysiological and Ecological Aspects of Seasonal Adaptations in a Water Strider, Aquarius paludum (A Mini Review)

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